CN112046708A - Hyperstatic-prevention lifting device and offshore platform lifting method - Google Patents
Hyperstatic-prevention lifting device and offshore platform lifting method Download PDFInfo
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- CN112046708A CN112046708A CN202010973858.1A CN202010973858A CN112046708A CN 112046708 A CN112046708 A CN 112046708A CN 202010973858 A CN202010973858 A CN 202010973858A CN 112046708 A CN112046708 A CN 112046708A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B85/00—Dismantling or scrapping vessels
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Abstract
The invention discloses an anti-statically indeterminate lifting device and an offshore platform lifting method, which solve the problem of statically indeterminate formed between each lifting arm and a platform and can ensure that the lifting arms always lift the platform, wherein the anti-statically indeterminate lifting device comprises the lifting arms and telescopic units hinged to the front ends of the lifting arms, and the telescopic units are used for connecting the offshore platform; the rear end of the lifting arm is fixedly connected with a floating body floating on the water surface; the plurality of lifting arms are provided, at least one of the plurality of lifting arms is used for a first side of the offshore platform, and at least one of the plurality of lifting arms is used for supporting a second side of the offshore platform.
Description
Technical Field
The invention belongs to the technical field of offshore platforms, and particularly relates to an anti-hyperstatic lifting device and an offshore platform lifting method.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The integrated disassembling technology for the ultra-large offshore platform is a technology for lifting the offshore platform integrally through four lifting arms on two sides. When a lifting arm in the existing design structure lifts a platform, the lifting arm is only in simple contact with the platform.
The inventor thinks that although the disassembly efficiency of the platform can be improved, the lifting arm can lift only by positioning the pile legs of the platform, but the disassembly safety cannot be guaranteed. Because the ocean platform is a rigid body, when the four lifting arms on two sides lift, the buoyancy tank supporting the lifting arms to rise can float up and down along with the waves under the action of the waves, and even if wave compensation is added, the bearing of each lifting arm cannot be ensured. The structure of the lifting arm is obtained through optimization, each arm has bearing limitation, if a certain arm is not stressed, the bearing of other arms is over limited, the lifting arm structure can be caused to fail, a static and uncertain problem is formed between the lifting arm and the platform, and accidents are easy to happen. This was also indeed demonstrated in experiments where the simulated ocean platform was prone to tilt.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an anti-hyperstatic lifting device and an offshore platform lifting method, which solve the problem of statically indeterminate formed between each lifting arm and a platform and can ensure that the lifting arms always lift the platform.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, the technical scheme of the invention provides an anti-statically indeterminate lifting device for an offshore platform, which is characterized by comprising a lifting arm and a telescopic unit hinged to the front end of the lifting arm, wherein the telescopic unit is used for connecting the offshore platform; the rear end of the lifting arm is fixedly connected with a floating body floating on the water surface; the plurality of lifting arms are provided, at least one of the plurality of lifting arms is used for a first side of the offshore platform, and at least one of the plurality of lifting arms is used for supporting a second side of the offshore platform.
In a second aspect, the technical scheme of the invention also provides a lifting method for the offshore platform, when the sensor detects the separation trend between the offshore platform and the lifting arm, the telescopic piece or the floating body is adjusted, and a certain pressure is always kept between the lifting arm and the platform; when the wave is compensated to the right position, the expansion piece restores the original state.
The technical scheme of the invention has the following beneficial effects:
1) according to the invention, the telescopic unit is additionally arranged between the lifting arm and the offshore platform, so that the hyperstatic problem can be effectively solved, a certain heave compensation effect is achieved, and the safety of the disassembling operation is ensured.
2) According to the invention, the used telescopic unit comprises a hydraulic cylinder or a buffer which has controllability, and the telescopic unit can be matched with the sensor in the application to control the wild state of the telescopic unit between the lifting arm and the offshore platform in real time, so that the contact between the lifting arm and the offshore platform is ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Figure 1 is a schematic view of the present invention using a hydraulic cylinder as a telescopic unit according to one or more embodiments,
FIG. 2 is a schematic illustration of the present invention when using a buffer as a telescoping unit, according to one or more embodiments.
In the figure: 1. offshore platform, 2, hydraulic cylinder, 3, lifting arm, 4, buffer, 5, cardan shaft.
The spacing or dimensions between each other are exaggerated to show the location of the various parts, and the illustration is for illustrative purposes only.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the invention expressly state otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Term interpretation section: the terms "mounted," "connected," "fixed," and the like in the present invention are to be understood in a broad sense, and for example, the terms "mounted," "connected," and "fixed" may be fixed, detachable, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As introduced by the background art, aiming at the defects in the prior art, the invention aims to provide a multi-arm lifting anti-statically indeterminate device, which ensures that a lifting arm always supports a platform and equivalently solves the statically indeterminate problem formed between each lifting arm and the platform.
Example 1
In an exemplary embodiment of the present invention, as shown in fig. 1, the present embodiment discloses a multi-arm lifting anti-hyperstatic device for offshore platforms, which includes a first semi-submersible vessel, a second semi-submersible vessel, a first lifting part, a second lifting part, a hydraulic cylinder 2 and a pressure sensor, wherein the rear end of the first lifting part is connected to the first semi-submersible vessel, and the rear end of the second lifting part is connected to the second semi-submersible vessel; the front end of first portion of lifting and the front end of second portion of lifting all are used for the platform structure that overlap joint offshore platform 1 is located the sea, the front end of first portion of lifting is connected with pneumatic cylinder 2 and pressure sensor, the front end of second portion of lifting is connected with pneumatic cylinder 2 and pressure sensor, the front end of first portion of lifting and the front end of second portion of lifting all lead to pneumatic cylinder 2 and link the overlap joint and be located the platform structure on sea, pneumatic cylinder 2 and pressure sensor all connect the controller, according to pressure sensor's data, 2 movements of controller control pneumatic cylinder are in order to keep the stability of being connected between platform structure and the portion of lifting.
Specifically, the upper end of the hydraulic cylinder 2 is connected with the platform through a spherical hinge, and the lower end of the hydraulic cylinder 2 is connected with the lifting arm 3 through a hinge. And a pressure sensor is additionally arranged between the hydraulic cylinder 2 and the platform. At the initial stage or the balance stage, the hydraulic cylinder 2 does not act, the lifting arm 3 and the platform are hinged in a common mode, the piston rod is grounded, when one arm descends due to the action of waves, the platform and the lifting arm 3 start to be separated, the pressure sensor displays that the pressure between the platform and the platform is reduced, the hydraulic cylinder 2 starts to act on the lower end of the hydraulic cylinder 2 for pressurization, certain pressure is guaranteed to exist between the lifting arm 3 and the platform all the time, when the waves are compensated in place, the lower end of the hydraulic cylinder 2 is decompressed, and the initial state is recovered.
In this embodiment, the controller may adopt a single chip microcomputer or a PLC.
More specifically, the hydraulic cylinder 2 in this embodiment is further connected to a hydraulic workstation, and in this embodiment, the controller controls a hydraulic pump in the hydraulic workstation, so as to control the extension and retraction of the hydraulic cylinder 2.
It will be appreciated that the hydraulic work station may independently control the operation of a plurality of hydraulic cylinders 2 simultaneously.
In this embodiment, the upper end of the hydraulic cylinder 2 is a telescopic end, and the lower end of the hydraulic cylinder 2 is a fixed end.
In other embodiments, the hydraulic cylinder 2 may be replaced by a pneumatic cylinder or other telescopic unit that satisfies the use condition, such as an electric push rod.
The first lifting part comprises a plurality of first lifting arms 3 which are arranged in parallel, and the second lifting part comprises a plurality of second lifting arms 3 which are arranged in parallel; a first lifting arm 3 and a second lifting arm 3.
DP systems are installed on the first semi-submersible ship and the second semi-submersible ship, and the first semi-submersible ship and the second semi-submersible ship are respectively positioned on two sides of the offshore structure.
The DP (dynamic positioning) system positioning and the compensation function of the lifting arm jointly realize that the offshore structure is static relative to the offshore structure before lifting.
The integrated disassembly and assembly system further comprises a third semi-submersible vessel, and the lifting arms 3 on the first semi-submersible vessel and the second semi-submersible vessel act simultaneously to unload the offshore structures onto the third semi-submersible vessel.
The first semi-submersible ship and the second semi-submersible ship are provided with a plurality of controllable cabin bodies, and the draft of the cabin bodies is controlled by a pneumatic pump.
In this embodiment, the lifting arms 3 of the first and second lifting sections are connected to and support the offshore platform 1 via the hydraulic cylinders 2.
Example 2
The damper 4 in this embodiment is one or more of a hydraulic damper 4, a spring damper 4, and a urethane damper 4.
It will be appreciated that when the spring damper 4 is used, the top of the end of the lifting arm 3 is provided with a cardan shaft 5, the top of the cardan shaft 5 is provided with the spring damper 4, and the rod of the spring damper 4 passes through a part of the offshore platform 1.
Example 3
In a typical implementation mode of the invention, the present embodiment discloses a method for using the multi-arm lifting anti-statically indeterminate device described in embodiment 1, that is, a method for lifting an offshore platform, in an initial state (a state where the sea surface is calm), the hydraulic cylinder 2 is not in action, the lifting arm 3 and the platform are in a common hinge joint, and a piston rod of the hydraulic cylinder 2 moves to the bottom of a cylinder body of the hydraulic cylinder 2 at this time.
When one arm in any one lifting part descends due to the action of waves, the platform and the lifting arm 3 start to be separated, the pressure sensor displays that the pressure between the platform and the lifting arm is reduced, the hydraulic cylinder 2 starts to act under the pushing of the hydraulic workstation, the lower end of the hydraulic cylinder 2 is pressurized, certain pressure is guaranteed to be always between the lifting arm 3 and the platform, and when the waves are compensated in place, the lower end of the hydraulic cylinder 2 is decompressed, and the initial state is recovered.
It can be understood that, in the whole process, the detection function of the pressure sensor is very important, and the existing diffused silicon pressure transmitter adopted by the pressure sensor in the embodiment has better waterproof performance and is beneficial to the stability of the system.
Example 4
In an exemplary embodiment of the present invention, this embodiment discloses a method for using the multi-arm lift anti-statically indeterminate device described in embodiment 2, that is, a method for lifting an offshore platform, wherein in an initial state (a state where the sea surface is calm), when the offshore platform 1 and the lifting arms 3 are to be separated, the plurality of lifting arms 3 can be ensured to contact the offshore platform 1 at the same time through the buffer 4.
When the offshore platform 1 inclines, the attitude sensor can read the inclination angle of the offshore platform 1 in time, so that the semi-submersible ship is controlled to perform heave compensation, the offshore platform 1 is always at a relatively safe inclination angle, and the phenomenon that the offshore platform 1 is toppled over due to overlarge angle is avoided.
Example 5
In a typical implementation manner of the invention, the embodiment also discloses an application of the multi-arm lifting hyperstatic prevention device in the embodiment 1 in a disassembling process of an offshore platform, when an offshore structure is disassembled, a first semi-submersible ship and a second semi-submersible ship approach the offshore structure from two sides of the offshore structure, and positions of the two semi-submersible ships relative to the offshore structure are positioned through a DP system of the semi-submersible ships;
the first lifting part and the second lifting part pass through a lifting point of the offshore structure and stop;
the first semi-submersible ship and the second semi-submersible ship are in ship-carrying arrangement, 5% of load of the offshore structure is transferred to the lifting arms 3 and the semi-submersible ships, and the first lifting arms 3 and the second lifting arms 3 are locked before lifting;
the first lifting part and the second lifting part act simultaneously to quickly lift the offshore structure;
the first semi-submersible ship and the second semi-submersible ship bear offshore structures, move synchronously and leave the supporting position of the offshore structures, the third semi-submersible ship moves to a position between the first semi-submersible ship and the second semi-submersible ship to prepare for loading the disassembled offshore structures, the lifting arms 3 on the first semi-submersible ship and the second semi-submersible ship simultaneously act to unload the offshore structures onto a semi-submersible ship III, and the semi-submersible ship III loads the offshore structures, transports the offshore structures back to a wharf and slides to the shore.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An anti-statically indeterminate lifting device for an offshore platform is characterized by comprising a lifting arm and a telescopic unit hinged to the front end of the lifting arm, wherein the telescopic unit is used for being connected with the offshore platform; the rear end of the lifting arm is fixedly connected with a floating body floating on the water surface; the plurality of lifting arms are provided, at least one of the plurality of lifting arms is used for a first side of the offshore platform, and at least one of the plurality of lifting arms is used for supporting a second side of the offshore platform.
2. The anti-statically-over-determined lifting device for the offshore platform as claimed in claim 1, wherein the telescopic unit is a hydraulic cylinder, and the end of the lifting arm is further provided with a pressure sensor, and the pressure sensor is installed between the hydraulic cylinder and the offshore platform to measure the pressure between the offshore platform and the lifting arm.
3. The anti-statically-over-determined jacking device for offshore platforms as claimed in claim 2, wherein the hydraulic cylinder is connected to a hydraulic pump, and the hydraulic pump and the pressure sensor are connected to a controller.
4. The anti-statically-over-determined lifting device for the offshore platform as claimed in claim 1, further comprising an attitude sensor mounted on the offshore platform, wherein the telescopic unit is a buffer, and the attitude sensor and the buffer are both connected with the controller.
5. The anti-statically-over-determined jacking device for the offshore platform as claimed in claim 4, wherein the buffer is one or more of a hydraulic buffer, a spring buffer and a polyurethane buffer.
6. The anti-statically-over-determined lifting device for the offshore platform as recited in claim 1, wherein the plurality of lifting arms at the first side of the offshore platform form a first lifting portion, the plurality of lifting arms at the second side of the offshore platform form a second lifting portion, and the first lifting portion and the second lifting portion are connected at front ends thereof.
7. An anti-hyperstatic jacking device for offshore platforms as in claim 1, characterized in that the buoyant body is a semi-submersible or a pontoon.
8. An anti-statically indeterminate lifting device as claimed in claim 7, characterised in that the semi-submersible is equipped with tanks which are connected to a pneumatic pump, the draught of the tanks being controlled by the pneumatic pump.
9. A dismounting and mounting system for an offshore platform is characterized by comprising an anti-statically indeterminate lifting device and a transport ship for transporting dismounted parts; the anti-statically indeterminate lifting device is as claimed in any one of claims 1 to 8.
10. A method for lifting an offshore platform is characterized in that when a sensor detects the separation trend between the offshore platform and a lifting arm, a telescopic piece or a floating body is adjusted to ensure that a certain pressure is always kept between the lifting arm and the platform; when the wave is compensated to the right position, the expansion piece restores the original state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010973858.1A CN112046708B (en) | 2020-09-16 | 2020-09-16 | Hyperstatic-prevention lifting device and offshore platform lifting method |
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| CN202010973858.1A CN112046708B (en) | 2020-09-16 | 2020-09-16 | Hyperstatic-prevention lifting device and offshore platform lifting method |
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